Color excesses of classical Cepheids in the uvby color system are estimated for the calibration stars with distances from the literature that are measured independently. Intrinsic photometric indices for these stars are calculated and a calibrated empirical relation between (b - y)0, period, [c1], and [m1] is derived through a linear fit. This relation is used to determine color excesses E(b-y) for 59 Cepheids. We also examine the period-color [log P : (b - y)0] relation, and find no signs of nonlinearity. We estimate the effective temperature and surface gravity of several Cepheids using both Kurucz and MARCS/SSG grids for [Fe=H]=0.0. We confirm that both temperature and surface gravity are higher, by about 150K and 0.4 respectively, when the MARCS/SSG atmospheric grids are used.

In order to determine color excess in the uvbyβ color system for high amplitude ± Scuti stars, reddening free [m1], [c1], and β indices data were obtained from the existing literature for 21 stars. Then, the three intrinsic relations of (b- y)0 - [m1], (b- y)0 -[c1], and (b-y)0 - β were investigated. Among these, it was shown that the (b-y)0 -[c1] relation is the most useful. By establishing intrinsic (b-y)0-[c1] relations for six reddening calibration stars, color excesses of other stars were determined.